PowerShell ConvertTo-Json object output with leading unwanted numbers

Below function is giving me required result except the numbers (0,1,2,0) populating before JSON object beginning. Can someone help me to get rid of those numbers.

$V1='11' $V2='1881' $V3='111','222','333'

$body=CreateJsonBody $V1 $V2 $V3

function CreateJsonBody{

    param($objectId,$AttributeId,$AttributeValues)

    $jsonBase=@{"objectId"= $objectId;}
    $vlist = New-Object System.Collections.ArrayList
    $alist = New-Object System.Collections.ArrayList

    foreach ($Val in $AttributeValues) {
        $vlist.Add(@{"value"= $Val;})
    }

    $alist.Add(@{"AttributeId"= $AttributeId;"AttributeValues"=$vlist;})
    $jsonBase.Add("attributes",$alist)
    return $jsonBase | ConvertTo-Json -Depth 10
}

Output:

PS C:\WINDOWS\system32> $body

0

1

2

0

{
    "objectId":  "105",
    "attributes":  [
                       {
                           "AttributeId":  "1887",
                           "AttributeValues":  [
                                                  {
                                                      "value":  "111"
                                                   },
                                                   {
                                                      "value":  "222"
                                                   },
                                                   {
                                                      "value":  "333"
                                                   }
                                               ]
                       }
                   ]
}